Shock turned pool surface black

marcperrys

In The Industry
Nov 2, 2019
7
Kissimmee
Shocked the pool today with Zappit and liner went black almost immediately. Has anyone got advice on treating this? From what I’m reading there’s copper in the pool and it’s oxidized when I’ve added the shock. Any help appreciated!
 

marcperrys

In The Industry
Nov 2, 2019
7
Kissimmee
Went back to service the pool today and the stains had disappeared. I’ve ordered some copper test strips so will see if that was the issue. Freaked me out that’s for sure!